Improvement in clay pjpes and apparatus for molding the same



UNITED STATES PATENT ()FF lVLLLIAM K. BLACK, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNCR TQ JOSEPH HAVVEY AND WILLIAM ADAMSON, OF SAME PLACE.

IMPROVEIMEXNT m CLAY PlPES AND APPARATUS FOR MOLDlNG THE SAME.

specification tormingp art of Letters Patent No. 159,146, dated January 26,1870; application filed December 21, 1874.

- To an whom it may concern:

Be it known that 1, WILLIAM K. BLACK,

' of. Philadelphia, Pennsylvania, haveinventedv more perfect junction can be formed with the end of an adjoining pipe. These objects I attain by the peculiarapparatus for molding the pipe, in the manner which I will now procoed to describe, reference being bad to the accompanying drawing, in which' Figure l is a vertical section of the lower portion of the molding apparatus; Fig. 2, a sectional plan on the line 1 2, Fl 1; and Fig. 3 a view of a modification.

A represents the clay-holding box of an I ordinary drain-pipe machine, and .B the former for the inside of thepipe, the lower end of this former being concentric with the opening "in the bottom of the box, but less in diameter than the same, so that an annular space, a", intervenes between the two. 1) represents the former for the inside of a socket or bell mouth of the pipe, and E the former for the outside of the same. The formers D and-E are iitted snugly to the under side of the former l3 and box A; but are readily remov-- able from the same, for a purpose described I hereafter. The former D has near the bottom an annular slotted llange, a, which is slightly curved upward, so as to impart a curved form to the end of the socket or bell-mouth of the pipe. To the former Dare also attached three sets of pins, b, each sctconsisting, in the presentinstanc'c, of four pins, which are beveled atthcir outer ends, as shown in Figs? and 3. An annular rib, (I, is formed upon the shoulder e of the former, the object of which is to form in that portion of the socket, against cause the pins 1) to make on the inner sides of the socket or bell-mouth four annular grooves, b, the beveled'ends of the pins 1) pressing the clay, soas to form the grooves without tearingthe clay. The formers D and E, and the body of clay contained between the same, are then lowered so that the clay, which is still fed down through the annular space av, forms the body of the pipe. When a pipe of the proper length has been molded it is removed from the formers l) and E, and the operation is repeated.

In some cases it may be advisable to use ,movable pins, insteadof using fixed pins, as

above described, and in some instances I prefer the arrangement shown in Fig.3, in which the spring-pins b may be ad vanccd or retracted by means of a central conical plate, h.

ll-he sockets of ordinary dram pipes have the straight ends, as shown b dotted lines in Fig. 4, and these areapt [,0 become fractured, as shown, when the pipe is roughly handled. By rounding the outer edges of the end of thesocke-t, as shown at y in Fig. 5, no sharp corners are presented and the danger of fracture is much lessened.-

lhe annular grooves formed in the inside of the socket afford a lirm hold for the cement, which is used for the tightfitting of the two pipes together.

I claim as my iiwention 1. The combination, in a clay-pipe molding machine, of the former D, with three or more sets of pins, b, arranged and operating substantially in the manner and for the purpose described.

2. The combination, substantially as descsibed, of theprojcction d and the slotted and curved flange a, with the former 1), for

the purpose set forth.

3. As a new article of manufacture a clay pipe, the socket of which has rounded ends y internal grooves I), and an annular groove, (1, in the shoulder, against which the end of the adjoining pipe hears, all as set forth.

In testimony whercof I- have signed my names to this specification in the presence of two subscribing witnesses.

WM. K. BLACK.

\Yitnesscs:

llrnnn'r llowsoN, 

